문서 파싱 및 추출(pdf, doc, docx, xls, xlsx, ppt, pptx) 필요 라이브러리 Apache PDFBox : http://pdfbox.apache.org/downloads.htmlApache POI : http://poi.apache.org/download.html pdf 파서import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import org.apache.pdfbox.cos.COSDocument;import org.apache.pdfbox.pdfparser.PDFParser;import org.apache.pdfbox.pdmo..